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<a name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
<a name="2" href="#2">2</a>   <em class="jxr_comment"> * Copyright 2006-2008 Michele Mostarda ( michele.mostarda@gmail.com ).</em>
<a name="3" href="#3">3</a>   <em class="jxr_comment"> * All Rights Reserved.</em>
<a name="4" href="#4">4</a>   <em class="jxr_comment"> *</em>
<a name="5" href="#5">5</a>   <em class="jxr_comment"> * Licensed under the Apache License, Version 2.0 (the 'License');</em>
<a name="6" href="#6">6</a>   <em class="jxr_comment"> * you may not use this file except in compliance with the License.</em>
<a name="7" href="#7">7</a>   <em class="jxr_comment"> * You may obtain a copy of the License at</em>
<a name="8" href="#8">8</a>   <em class="jxr_comment"> *</em>
<a name="9" href="#9">9</a>   <em class="jxr_comment"> * <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a name="10" href="#10">10</a>  <em class="jxr_comment"> *</em>
<a name="11" href="#11">11</a>  <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing, software</em>
<a name="12" href="#12">12</a>  <em class="jxr_comment"> * distributed under the License is distributed on an 'AS IS' BASIS,</em>
<a name="13" href="#13">13</a>  <em class="jxr_comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
<a name="14" href="#14">14</a>  <em class="jxr_comment"> * See the License for the specific language governing permissions and</em>
<a name="15" href="#15">15</a>  <em class="jxr_comment"> * limitations under the License.</em>
<a name="16" href="#16">16</a>  <em class="jxr_comment"> */</em>
<a name="17" href="#17">17</a>  
<a name="18" href="#18">18</a>  <strong class="jxr_keyword">package</strong> org.graphnav.util;
<a name="19" href="#19">19</a>  
<a name="20" href="#20">20</a>  <strong class="jxr_keyword">import</strong> java.awt.Point;
<a name="21" href="#21">21</a>  <strong class="jxr_keyword">import</strong> java.awt.geom.Line2D;
<a name="22" href="#22">22</a>  <strong class="jxr_keyword">import</strong> java.awt.geom.Point2D;
<a name="23" href="#23">23</a>  <strong class="jxr_keyword">import</strong> java.awt.geom.Rectangle2D;
<a name="24" href="#24">24</a>  
<a name="25" href="#25">25</a>  <em class="jxr_javadoccomment">/**</em>
<a name="26" href="#26">26</a>  <em class="jxr_javadoccomment"> * Some geometry function utilities.</em>
<a name="27" href="#27">27</a>  <em class="jxr_javadoccomment"> */</em>
<a name="28" href="#28">28</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../org/graphnav/util/GeomUtils.html">GeomUtils</a> {
<a name="29" href="#29">29</a>  
<a name="30" href="#30">30</a>      <em class="jxr_javadoccomment">/**</em>
<a name="31" href="#31">31</a>  <em class="jxr_javadoccomment">     * Defines a rectangle.</em>
<a name="32" href="#32">32</a>  <em class="jxr_javadoccomment">     */</em>
<a name="33" href="#33">33</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">class</strong> <a href="../../../org/graphnav/util/GeomUtils.html">Rect</a> {
<a name="34" href="#34">34</a>  
<a name="35" href="#35">35</a>          <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">double</strong> m;
<a name="36" href="#36">36</a>          <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">double</strong> q;
<a name="37" href="#37">37</a>  
<a name="38" href="#38">38</a>          <strong class="jxr_keyword">protected</strong> <a href="../../../org/graphnav/util/GeomUtils.html">Rect</a>(<strong class="jxr_keyword">double</strong> m, <strong class="jxr_keyword">double</strong> q) {
<a name="39" href="#39">39</a>              <strong class="jxr_keyword">this</strong>.m = m;
<a name="40" href="#40">40</a>              <strong class="jxr_keyword">this</strong>.q = q;
<a name="41" href="#41">41</a>          }
<a name="42" href="#42">42</a>  
<a name="43" href="#43">43</a>          <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">double</strong> getM() {
<a name="44" href="#44">44</a>              <strong class="jxr_keyword">return</strong> m;
<a name="45" href="#45">45</a>          }
<a name="46" href="#46">46</a>  
<a name="47" href="#47">47</a>          <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">double</strong> getQ() {
<a name="48" href="#48">48</a>              <strong class="jxr_keyword">return</strong> q;
<a name="49" href="#49">49</a>          }
<a name="50" href="#50">50</a>      }
<a name="51" href="#51">51</a>  
<a name="52" href="#52">52</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Indicates no intersection between shapes */</em>
<a name="53" href="#53">53</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> NO_INTERSECTION = 0;
<a name="54" href="#54">54</a>  
<a name="55" href="#55">55</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Indicates intersection between shapes */</em>
<a name="56" href="#56">56</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> COINCIDENT      = 1;
<a name="57" href="#57">57</a>  
<a name="58" href="#58">58</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Indicates two lines are parallel */</em>
<a name="59" href="#59">59</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> PARALLEL        = 2;
<a name="60" href="#60">60</a>      
<a name="61" href="#61">61</a>       <em class="jxr_javadoccomment">/**</em>
<a name="62" href="#62">62</a>  <em class="jxr_javadoccomment">      * Compute the intersection of two line segments.</em>
<a name="63" href="#63">63</a>  <em class="jxr_javadoccomment">      * @param a the first line segment</em>
<a name="64" href="#64">64</a>  <em class="jxr_javadoccomment">      * @param b the second line segment</em>
<a name="65" href="#65">65</a>  <em class="jxr_javadoccomment">      * @param intersect a Point in which to store the intersection point</em>
<a name="66" href="#66">66</a>  <em class="jxr_javadoccomment">      * @return the intersection code. One of {@link #NO_INTERSECTION},</em>
<a name="67" href="#67">67</a>  <em class="jxr_javadoccomment">      * {@link #COINCIDENT}, or {@link #PARALLEL}.</em>
<a name="68" href="#68">68</a>  <em class="jxr_javadoccomment">      */</em>
<a name="69" href="#69">69</a>       <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">int</strong> intersectLineLine(Line2D a, Line2D b, Point2D intersect) {
<a name="70" href="#70">70</a>           <strong class="jxr_keyword">double</strong> a1x = a.getX1(), a1y = a.getY1();
<a name="71" href="#71">71</a>           <strong class="jxr_keyword">double</strong> a2x = a.getX2(), a2y = a.getY2();
<a name="72" href="#72">72</a>           <strong class="jxr_keyword">double</strong> b1x = b.getX1(), b1y = b.getY1();
<a name="73" href="#73">73</a>           <strong class="jxr_keyword">double</strong> b2x = b.getX2(), b2y = b.getY2();
<a name="74" href="#74">74</a>           <strong class="jxr_keyword">return</strong> intersectLineLine(a1x,a1y,a2x,a2y,b1x,b1y,b2x,b2y,intersect);
<a name="75" href="#75">75</a>       }
<a name="76" href="#76">76</a>  
<a name="77" href="#77">77</a>       <em class="jxr_javadoccomment">/**</em>
<a name="78" href="#78">78</a>  <em class="jxr_javadoccomment">      * Compute the intersection of two line segments.</em>
<a name="79" href="#79">79</a>  <em class="jxr_javadoccomment">      * @param a1x the x-coordinate of the first endpoint of the first line</em>
<a name="80" href="#80">80</a>  <em class="jxr_javadoccomment">      * @param a1y the y-coordinate of the first endpoint of the first line</em>
<a name="81" href="#81">81</a>  <em class="jxr_javadoccomment">      * @param a2x the x-coordinate of the second endpoint of the first line</em>
<a name="82" href="#82">82</a>  <em class="jxr_javadoccomment">      * @param a2y the y-coordinate of the second endpoint of the first line</em>
<a name="83" href="#83">83</a>  <em class="jxr_javadoccomment">      * @param b1x the x-coordinate of the first endpoint of the second line</em>
<a name="84" href="#84">84</a>  <em class="jxr_javadoccomment">      * @param b1y the y-coordinate of the first endpoint of the second line</em>
<a name="85" href="#85">85</a>  <em class="jxr_javadoccomment">      * @param b2x the x-coordinate of the second endpoint of the second line</em>
<a name="86" href="#86">86</a>  <em class="jxr_javadoccomment">      * @param b2y the y-coordinate of the second endpoint of the second line</em>
<a name="87" href="#87">87</a>  <em class="jxr_javadoccomment">      * @param intersect a Point in which to store the intersection point</em>
<a name="88" href="#88">88</a>  <em class="jxr_javadoccomment">      * @return the intersection code. One of {@link #NO_INTERSECTION},</em>
<a name="89" href="#89">89</a>  <em class="jxr_javadoccomment">      * {@link #COINCIDENT}, or {@link #PARALLEL}.</em>
<a name="90" href="#90">90</a>  <em class="jxr_javadoccomment">      */</em>
<a name="91" href="#91">91</a>       <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">int</strong> intersectLineLine(<strong class="jxr_keyword">double</strong> a1x, <strong class="jxr_keyword">double</strong> a1y, <strong class="jxr_keyword">double</strong> a2x,
<a name="92" href="#92">92</a>           <strong class="jxr_keyword">double</strong> a2y, <strong class="jxr_keyword">double</strong> b1x, <strong class="jxr_keyword">double</strong> b1y, <strong class="jxr_keyword">double</strong> b2x, <strong class="jxr_keyword">double</strong> b2y,
<a name="93" href="#93">93</a>           Point2D intersect)
<a name="94" href="#94">94</a>       {
<a name="95" href="#95">95</a>           <strong class="jxr_keyword">double</strong> ua_t = (b2x-b1x)*(a1y-b1y)-(b2y-b1y)*(a1x-b1x);
<a name="96" href="#96">96</a>           <strong class="jxr_keyword">double</strong> ub_t = (a2x-a1x)*(a1y-b1y)-(a2y-a1y)*(a1x-b1x);
<a name="97" href="#97">97</a>           <strong class="jxr_keyword">double</strong> u_b  = (b2y-b1y)*(a2x-a1x)-(b2x-b1x)*(a2y-a1y);
<a name="98" href="#98">98</a>  
<a name="99" href="#99">99</a>           <strong class="jxr_keyword">if</strong> ( u_b != 0 ) {
<a name="100" href="#100">100</a>              <strong class="jxr_keyword">double</strong> ua = ua_t / u_b;
<a name="101" href="#101">101</a>              <strong class="jxr_keyword">double</strong> ub = ub_t / u_b;
<a name="102" href="#102">102</a> 
<a name="103" href="#103">103</a>              <strong class="jxr_keyword">if</strong> ( 0 &lt;= ua &amp;&amp; ua &lt;= 1 &amp;&amp; 0 &lt;= ub &amp;&amp; ub &lt;= 1 ) {
<a name="104" href="#104">104</a>                  intersect.setLocation(a1x+ua*(a2x-a1x), a1y+ua*(a2y-a1y));
<a name="105" href="#105">105</a>                  <strong class="jxr_keyword">return</strong> 1;
<a name="106" href="#106">106</a>              } <strong class="jxr_keyword">else</strong> {
<a name="107" href="#107">107</a>                  <strong class="jxr_keyword">return</strong> NO_INTERSECTION;
<a name="108" href="#108">108</a>              }
<a name="109" href="#109">109</a>          } <strong class="jxr_keyword">else</strong> {
<a name="110" href="#110">110</a>              <strong class="jxr_keyword">return</strong> ( ua_t == 0 || ub_t == 0 ? COINCIDENT : PARALLEL );
<a name="111" href="#111">111</a>          }
<a name="112" href="#112">112</a>      }
<a name="113" href="#113">113</a> 
<a name="114" href="#114">114</a>      <em class="jxr_javadoccomment">/**</em>
<a name="115" href="#115">115</a> <em class="jxr_javadoccomment">      * Compute the intersection of a line and a rectangle.</em>
<a name="116" href="#116">116</a> <em class="jxr_javadoccomment">      * @param l1x the first endpoint x of the line</em>
<a name="117" href="#117">117</a> <em class="jxr_javadoccomment">      * @param l1y the first endpoint y of the line</em>
<a name="118" href="#118">118</a> <em class="jxr_javadoccomment">      * @param l2x the second endpoint x of the line</em>
<a name="119" href="#119">119</a> <em class="jxr_javadoccomment">      * @param l2y the second endpoint y of the line</em>
<a name="120" href="#120">120</a> <em class="jxr_javadoccomment">      * @param rx the rectangle x pos</em>
<a name="121" href="#121">121</a> <em class="jxr_javadoccomment">      * @param ry the rectangle y pos</em>
<a name="122" href="#122">122</a> <em class="jxr_javadoccomment">      * @param rw the rectangle width</em>
<a name="123" href="#123">123</a> <em class="jxr_javadoccomment">      * @param rh the rectangle height</em>
<a name="124" href="#124">124</a> <em class="jxr_javadoccomment">      * @param pts a length 2 or greater array of points in which to store</em>
<a name="125" href="#125">125</a> <em class="jxr_javadoccomment">      * the results</em>
<a name="126" href="#126">126</a> <em class="jxr_javadoccomment">      * @return the intersection code. One of {@link #NO_INTERSECTION},</em>
<a name="127" href="#127">127</a> <em class="jxr_javadoccomment">      * {@link #COINCIDENT}, or {@link #PARALLEL}.</em>
<a name="128" href="#128">128</a> <em class="jxr_javadoccomment">      */</em>
<a name="129" href="#129">129</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">int</strong> intersectLineRectangle(<strong class="jxr_keyword">double</strong> l1x, <strong class="jxr_keyword">double</strong> l1y, <strong class="jxr_keyword">double</strong> l2x, <strong class="jxr_keyword">double</strong> l2y, <strong class="jxr_keyword">double</strong> rx, <strong class="jxr_keyword">double</strong> ry, <strong class="jxr_keyword">double</strong> rw, <strong class="jxr_keyword">double</strong> rh, Point2D[] pts) {
<a name="130" href="#130">130</a>          <strong class="jxr_keyword">double</strong> mxx = rx + rw, mxy = ry + rh;
<a name="131" href="#131">131</a>          <strong class="jxr_keyword">int</strong> i = 0;
<a name="132" href="#132">132</a>          <strong class="jxr_keyword">if</strong> ( intersectLineLine(rx,ry,mxx,ry,l1x,l1y,l2x,l2y,pts[i]) &gt; 0 ) i++;
<a name="133" href="#133">133</a>          <strong class="jxr_keyword">if</strong> ( intersectLineLine(mxx,ry,mxx,mxy,l1x,l1y,l2x,l2y,pts[i]) &gt; 0 ) i++;
<a name="134" href="#134">134</a>          <strong class="jxr_keyword">if</strong> ( i == 2 ) <strong class="jxr_keyword">return</strong> i;
<a name="135" href="#135">135</a>          <strong class="jxr_keyword">if</strong> ( intersectLineLine(mxx,mxy,rx,mxy,l1x,l1y,l2x,l2y,pts[i]) &gt; 0 ) i++;
<a name="136" href="#136">136</a>          <strong class="jxr_keyword">if</strong> ( i == 2 ) <strong class="jxr_keyword">return</strong> i;
<a name="137" href="#137">137</a>          <strong class="jxr_keyword">if</strong> ( intersectLineLine(rx,mxy,rx,ry,l1x,l1y,l2x,l2y,pts[i]) &gt; 0 ) i++;
<a name="138" href="#138">138</a>          <strong class="jxr_keyword">return</strong> i;
<a name="139" href="#139">139</a>      }
<a name="140" href="#140">140</a> 
<a name="141" href="#141">141</a>      <em class="jxr_javadoccomment">/**</em>
<a name="142" href="#142">142</a> <em class="jxr_javadoccomment">      * Compute the intersection of a line and a rectangle.</em>
<a name="143" href="#143">143</a> <em class="jxr_javadoccomment">      * @param l the line</em>
<a name="144" href="#144">144</a> <em class="jxr_javadoccomment">      * @param r the rectangle</em>
<a name="145" href="#145">145</a> <em class="jxr_javadoccomment">      * @param pts a length 2 or greater array of points in which to store</em>
<a name="146" href="#146">146</a> <em class="jxr_javadoccomment">      * the results</em>
<a name="147" href="#147">147</a> <em class="jxr_javadoccomment">      * @return the intersection code. One of {@link #NO_INTERSECTION},</em>
<a name="148" href="#148">148</a> <em class="jxr_javadoccomment">      * {@link #COINCIDENT}, or {@link #PARALLEL}.</em>
<a name="149" href="#149">149</a> <em class="jxr_javadoccomment">      */</em>
<a name="150" href="#150">150</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">int</strong> intersectLineRectangle(Line2D l, Rectangle2D r, Point2D[] pts) {
<a name="151" href="#151">151</a>          <strong class="jxr_keyword">double</strong> a1x = l.getX1(), a1y = l.getY1();
<a name="152" href="#152">152</a>          <strong class="jxr_keyword">double</strong> a2x = l.getX2(), a2y = l.getY2();
<a name="153" href="#153">153</a>          <strong class="jxr_keyword">double</strong> mxx = r.getMaxX(), mxy = r.getMaxY();
<a name="154" href="#154">154</a>          <strong class="jxr_keyword">double</strong> mnx = r.getMinX(), mny = r.getMinY();
<a name="155" href="#155">155</a> 
<a name="156" href="#156">156</a>          <strong class="jxr_keyword">if</strong> ( pts[0] == <strong class="jxr_keyword">null</strong> ) pts[0] = <strong class="jxr_keyword">new</strong> Point2D.Double();
<a name="157" href="#157">157</a>          <strong class="jxr_keyword">if</strong> ( pts[1] == <strong class="jxr_keyword">null</strong> ) pts[1] = <strong class="jxr_keyword">new</strong> Point2D.Double();
<a name="158" href="#158">158</a> 
<a name="159" href="#159">159</a>          <strong class="jxr_keyword">int</strong> i = 0;
<a name="160" href="#160">160</a>          <strong class="jxr_keyword">if</strong> ( intersectLineLine(mnx,mny,mxx,mny,a1x,a1y,a2x,a2y,pts[i]) &gt; 0 ) i++;
<a name="161" href="#161">161</a>          <strong class="jxr_keyword">if</strong> ( intersectLineLine(mxx,mny,mxx,mxy,a1x,a1y,a2x,a2y,pts[i]) &gt; 0 ) i++;
<a name="162" href="#162">162</a>          <strong class="jxr_keyword">if</strong> ( i == 2 ) <strong class="jxr_keyword">return</strong> i;
<a name="163" href="#163">163</a>          <strong class="jxr_keyword">if</strong> ( intersectLineLine(mxx,mxy,mnx,mxy,a1x,a1y,a2x,a2y,pts[i]) &gt; 0 ) i++;
<a name="164" href="#164">164</a>          <strong class="jxr_keyword">if</strong> ( i == 2 ) <strong class="jxr_keyword">return</strong> i;
<a name="165" href="#165">165</a>          <strong class="jxr_keyword">if</strong> ( intersectLineLine(mnx,mxy,mnx,mny,a1x,a1y,a2x,a2y,pts[i]) &gt; 0 ) i++;
<a name="166" href="#166">166</a>          <strong class="jxr_keyword">return</strong> i;
<a name="167" href="#167">167</a>      }
<a name="168" href="#168">168</a> 
<a name="169" href="#169">169</a>      <em class="jxr_javadoccomment">/**</em>
<a name="170" href="#170">170</a> <em class="jxr_javadoccomment">      * Compute the intersection of a line and a rectangle.</em>
<a name="171" href="#171">171</a> <em class="jxr_javadoccomment">      * @param a1 the first endpoint of the line</em>
<a name="172" href="#172">172</a> <em class="jxr_javadoccomment">      * @param a2 the second endpoint of the line</em>
<a name="173" href="#173">173</a> <em class="jxr_javadoccomment">      * @param r the rectangle</em>
<a name="174" href="#174">174</a> <em class="jxr_javadoccomment">      * @param pts a length 2 or greater array of points in which to store</em>
<a name="175" href="#175">175</a> <em class="jxr_javadoccomment">      * the results</em>
<a name="176" href="#176">176</a> <em class="jxr_javadoccomment">      * @return the intersection code. One of {@link #NO_INTERSECTION},</em>
<a name="177" href="#177">177</a> <em class="jxr_javadoccomment">      * {@link #COINCIDENT}, or {@link #PARALLEL}.</em>
<a name="178" href="#178">178</a> <em class="jxr_javadoccomment">      */</em>
<a name="179" href="#179">179</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">int</strong> intersectLineRectangle(Point2D a1, Point2D a2, Rectangle2D r, Point2D[] pts) {
<a name="180" href="#180">180</a>          <strong class="jxr_keyword">double</strong> a1x = a1.getX(), a1y = a1.getY();
<a name="181" href="#181">181</a>          <strong class="jxr_keyword">double</strong> a2x = a2.getX(), a2y = a2.getY();
<a name="182" href="#182">182</a>          <strong class="jxr_keyword">double</strong> mxx = r.getMaxX(), mxy = r.getMaxY();
<a name="183" href="#183">183</a>          <strong class="jxr_keyword">double</strong> mnx = r.getMinX(), mny = r.getMinY();
<a name="184" href="#184">184</a> 
<a name="185" href="#185">185</a>          <strong class="jxr_keyword">if</strong> ( pts[0] == <strong class="jxr_keyword">null</strong> ) pts[0] = <strong class="jxr_keyword">new</strong> Point2D.Double();
<a name="186" href="#186">186</a>          <strong class="jxr_keyword">if</strong> ( pts[1] == <strong class="jxr_keyword">null</strong> ) pts[1] = <strong class="jxr_keyword">new</strong> Point2D.Double();
<a name="187" href="#187">187</a> 
<a name="188" href="#188">188</a>          <strong class="jxr_keyword">int</strong> i = 0;
<a name="189" href="#189">189</a>          <strong class="jxr_keyword">if</strong> ( intersectLineLine(mnx,mny,mxx,mny,a1x,a1y,a2x,a2y,pts[i]) &gt; 0 ) i++;
<a name="190" href="#190">190</a>          <strong class="jxr_keyword">if</strong> ( intersectLineLine(mxx,mny,mxx,mxy,a1x,a1y,a2x,a2y,pts[i]) &gt; 0 ) i++;
<a name="191" href="#191">191</a>          <strong class="jxr_keyword">if</strong> ( i == 2 ) <strong class="jxr_keyword">return</strong> i;
<a name="192" href="#192">192</a>          <strong class="jxr_keyword">if</strong> ( intersectLineLine(mxx,mxy,mnx,mxy,a1x,a1y,a2x,a2y,pts[i]) &gt; 0 ) i++;
<a name="193" href="#193">193</a>          <strong class="jxr_keyword">if</strong> ( i == 2 ) <strong class="jxr_keyword">return</strong> i;
<a name="194" href="#194">194</a>          <strong class="jxr_keyword">if</strong> ( intersectLineLine(mnx,mxy,mnx,mny,a1x,a1y,a2x,a2y,pts[i]) &gt; 0 ) i++;
<a name="195" href="#195">195</a>          <strong class="jxr_keyword">return</strong> i;
<a name="196" href="#196">196</a>      }
<a name="197" href="#197">197</a> 
<a name="198" href="#198">198</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> Point getRoundPosition(<strong class="jxr_keyword">int</strong> centerX, <strong class="jxr_keyword">int</strong> centerY, <strong class="jxr_keyword">int</strong> total, <strong class="jxr_keyword">int</strong> current) {
<a name="199" href="#199">199</a>         <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">double</strong> RADIUS = 100d;
<a name="200" href="#200">200</a>         <strong class="jxr_keyword">if</strong>(current &lt; 0 || total &lt; 0) {
<a name="201" href="#201">201</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException();
<a name="202" href="#202">202</a>         }
<a name="203" href="#203">203</a>         <strong class="jxr_keyword">if</strong>(current &gt; total) {
<a name="204" href="#204">204</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException();
<a name="205" href="#205">205</a>         }
<a name="206" href="#206">206</a>         <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">double</strong> angle = 2.0d * Math.PI / (<strong class="jxr_keyword">double</strong>) total * (<strong class="jxr_keyword">double</strong>) current;
<a name="207" href="#207">207</a>         <em class="jxr_comment">//final double angle = Math.PI / 2;</em>
<a name="208" href="#208">208</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> Point(centerX + (<strong class="jxr_keyword">int</strong>) ( Math.cos(angle) * RADIUS ), centerY + (<strong class="jxr_keyword">int</strong>) (Math.sin(angle) * RADIUS) );
<a name="209" href="#209">209</a>     }
<a name="210" href="#210">210</a> 
<a name="211" href="#211">211</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <a href="../../../org/graphnav/util/GeomUtils.html">Rect</a> rectThrough(<strong class="jxr_keyword">double</strong> p1x, <strong class="jxr_keyword">double</strong> p1y, <strong class="jxr_keyword">double</strong> p2x, <strong class="jxr_keyword">double</strong> p2y) {
<a name="212" href="#212">212</a>         <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">double</strong> m = (p2y - p1y) / (p2x - p1x);
<a name="213" href="#213">213</a>         <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">double</strong> q = p1y - m * p1x;
<a name="214" href="#214">214</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> <a href="../../../org/graphnav/util/GeomUtils.html">Rect</a>(m,q);
<a name="215" href="#215">215</a>     }
<a name="216" href="#216">216</a> 
<a name="217" href="#217">217</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">double</strong> distanceBetween(<a href="../../../org/graphnav/util/GeomUtils.html">Rect</a> r, <strong class="jxr_keyword">double</strong> px, <strong class="jxr_keyword">double</strong> py) {
<a name="218" href="#218">218</a>         <strong class="jxr_keyword">return</strong> ( py - r.m * px - r.q ) / Math.sqrt(1.0d + Math.pow(r.m, 2.0d));
<a name="219" href="#219">219</a>     }
<a name="220" href="#220">220</a> 
<a name="221" href="#221">221</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">double</strong> distanceBetween(<strong class="jxr_keyword">double</strong> p1x, <strong class="jxr_keyword">double</strong> p1y, <strong class="jxr_keyword">double</strong> p2x, <strong class="jxr_keyword">double</strong> p2y, <strong class="jxr_keyword">double</strong> tx, <strong class="jxr_keyword">double</strong> ty) {
<a name="222" href="#222">222</a>         <strong class="jxr_keyword">return</strong> distanceBetween( rectThrough( p1x, p1y, p2x, p2y ), tx, ty );
<a name="223" href="#223">223</a>     }
<a name="224" href="#224">224</a> 
<a name="225" href="#225">225</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">boolean</strong> inRange(<strong class="jxr_keyword">double</strong> p1x, <strong class="jxr_keyword">double</strong> p1y, <strong class="jxr_keyword">double</strong> p2x, <strong class="jxr_keyword">double</strong> p2y, <strong class="jxr_keyword">double</strong> tx, <strong class="jxr_keyword">double</strong> ty, <strong class="jxr_keyword">double</strong> maxDistance) {
<a name="226" href="#226">226</a>         <strong class="jxr_keyword">double</strong> minX, maxX, minY, maxY;
<a name="227" href="#227">227</a>         <strong class="jxr_keyword">if</strong>(p1x &lt;= p2x) {
<a name="228" href="#228">228</a>             minX = p1x;
<a name="229" href="#229">229</a>             maxX = p2x;
<a name="230" href="#230">230</a>         } <strong class="jxr_keyword">else</strong> {
<a name="231" href="#231">231</a>             minX = p2x;
<a name="232" href="#232">232</a>             maxX = p1x;
<a name="233" href="#233">233</a>         }
<a name="234" href="#234">234</a>         <strong class="jxr_keyword">if</strong>(p1y &lt;= p2y) {
<a name="235" href="#235">235</a>             minY = p1y;
<a name="236" href="#236">236</a>             maxY = p2y;
<a name="237" href="#237">237</a>         } <strong class="jxr_keyword">else</strong> {
<a name="238" href="#238">238</a>             minY = p2y;
<a name="239" href="#239">239</a>             maxY = p1y;
<a name="240" href="#240">240</a>         }
<a name="241" href="#241">241</a>         <strong class="jxr_keyword">if</strong>(tx &lt; minX || tx &gt; maxX || ty &lt; minY || ty &gt; maxY) {
<a name="242" href="#242">242</a>             <strong class="jxr_keyword">return</strong> false;
<a name="243" href="#243">243</a>         }
<a name="244" href="#244">244</a>         <strong class="jxr_keyword">return</strong> Math.abs( distanceBetween(p1x, p1y, p2x, p2y, tx, ty) ) &lt;= maxDistance;
<a name="245" href="#245">245</a>     }
<a name="246" href="#246">246</a> 
<a name="247" href="#247">247</a> }
</pre>
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